Basilica is a title of honour given to certain churches because of their antiquity, dignity, historical importance or significance as centres of worship.

There are four major basilicas, all of which are in Rome: St. John Lateran (the Cathedral of the diocese of Rome), St. Peter's of the Vatican, St. Paul's outside the Walls, and St. Mary Major. Major basilicas have the papal altar and holy door, which is open during the beginning of a Jubilee Year.

The pope also grants to certain churches around the world the title of minor basilica. Minor basilicas enjoy certain ceremonial privileges. The papal arms may be displayed on the churches' exteriors.